Solved

String Concat problem, not working

Posted on 2013-06-22
3
354 Views
Last Modified: 2013-06-23
I am trying to concat 9 edit controls. I don't see why this code is not working. Can anyone help me get this working?

    char szCombo1[2], szCombo2[2],szCombo3[2],
         szCombo4[2],szCombo5[2],szCombo6[2],
         szCombo7[2],szCombo8[2],szCombo9[2];
     
    GetDlgItemText(gl_hWnd, IDC_COMBO1, szCombo1, strlen(szCombo1));
    GetDlgItemText(gl_hWnd, IDC_COMBO2, szCombo2, strlen(szCombo2));
    GetDlgItemText(gl_hWnd, IDC_COMBO3, szCombo3, strlen(szCombo3));
    GetDlgItemText(gl_hWnd, IDC_COMBO4, szCombo4, strlen(szCombo4));
    GetDlgItemText(gl_hWnd, IDC_COMBO5, szCombo5, strlen(szCombo5));
    GetDlgItemText(gl_hWnd, IDC_COMBO6, szCombo6, strlen(szCombo6));
    GetDlgItemText(gl_hWnd, IDC_COMBO7, szCombo7, strlen(szCombo7));
    GetDlgItemText(gl_hWnd, IDC_COMBO8, szCombo8, strlen(szCombo8));
    GetDlgItemText(gl_hWnd, IDC_COMBO9, szCombo9, strlen(szCombo9));
              
    std::string strCombo1(szCombo1);
    std::string strCombo2(szCombo2);
    std::string strCombo3(szCombo3);
    std::string strCombo4(szCombo4);
    std::string strCombo5(szCombo5);
    std::string strCombo6(szCombo6);
    std::string strCombo7(szCombo7);
    std::string strCombo8(szCombo8);
    std::string strCombo9(szCombo9);
    std:string strUserCombo;
    strUserCombo = strCombo1+strCombo2+strCombo3+strCombo4+strCombo5+strCombo6+strCombo7+strCombo8+strCombo9;
    MessageBox(NULL,strUserCombo.c_str(),"DEBUG",NULL);

Open in new window


Thanks!
0
Comment
Question by:edvinson
  • 2
3 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 39268181
In the above, 'strlen()' will return 0 or an undefined value, that's why that won't work. You need to provide the actual size of the buffer as the last argument. Are you sure that should be two bytes?
0
 
LVL 1

Author Comment

by:edvinson
ID: 39268385
I am not sure it should be two bytes, I am expecting the user to enter two digits, thats why i chose 2 bytes. should I only use 1? Or something different? What if I dont know how many characters they entered?
0
 
LVL 86

Accepted Solution

by:
jkr earned 500 total points
ID: 39268638
If you are expecting two digits, make that at least 3 bytes (the two digits plus the terminating NULL byte). However, a larger buffer won't hurt ;o)
Anyway, 'strlen()' is the wrong way, since it will report the lenght of the string stored in that buffer - and since there is none prior to your call, that's bound to fail.
0

Featured Post

Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

IntroductionThis article is the second in a three part article series on the Visual Studio 2008 Debugger.  It provides tips in setting and using breakpoints. If not familiar with this debugger, you can find a basic introduction in the EE article loc…
Many modern programming languages support the concept of a property -- a class member that combines characteristics of both a data member and a method.  These are sometimes called "smart fields" because you can add logic that is applied automaticall…
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.

776 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question